Postdoc Possibilities
By Renee Papaluca
Thinking about postgraduate research? This column has some advice for you, courtesy of a recent PhD graduate.
Edited by Ruby Dempsey and Breana Galea
December 10, 2021
Illustration by Casey Boswell
Marty recently completed his PhD in the Urban Light Lab, School of Biosciences. In his spare time, Marty enjoys birdwatching, Lego and science fiction.
Image included with permission
What was the ‘lightbulb moment’ that prompted you to study science?
“I have always enjoyed the outdoors. For example, bushwalking, snorkelling, birdwatching — all that sort of stuff. I am more of a latecomer to science. About 10 years ago, I took long-service leave from my job. I used to be a lawyer. I ended up spending a lot of time doing volunteer work for conservation and restoration organisations… and I was exposed for the first time to the world of science and ecology. The work involved things like cleaning up rubbish, tree planting, weed removal, and banding and recapturing birds with researchers. It was really eye-opening! I realised I could do this for a job… I had never studied science, apart from chemistry at school. I had never been exposed to ecology or really considered it as a potential career option. Having that opportunity to immerse myself in nature in a more constructive and helpful way, rather than being a passive observer, really got me thinking.”
Why did you choose to complete a research pathway?
“So, I came into this not having an undergraduate degree in science. I completed a Masters of Environment to begin with. My thinking there was to try and get into environmental management, conservation or restoration management. As part of that masters, I completed a couple of third-year animal behaviour subjects. I found this really interesting as I hadn’t studied much about the behaviour of wildlife. Off the back of that, I decided to focus on this area for my research capstone subject. I met Dr Therésa Jones [current supervisor] and … did a mini research project on artificial light at night which is her area of specialization. From there, I got hooked on research… I wanted to find out more and, from there, decided to complete a PhD… There’s so much to learn about the world. Being in the position where the world now knows something that it once didn’t because of your work is really powerful.”
MARTY LOCKETT
What was the focus of your PhD research? Why did you choose this area?
“My main project was looking at the effects of artificial light at night on an important food chain in Eucalyptus woodlands.”
“There's a lot of research on the effects of artificial light at night on individual organisms… There's less but increasing research on interactions between species. As you spread out wider, there's [even] less research on more complex communities and on the wider cascading ecological effects of artificial light at night. I wanted to look into the effects of artificial light on a system that was underexplored and really important here in Australia.”
“I chose a specific Eucalyptus woodland food chain consisting of river red gum trees, lerp psyllids, and birds that eat them. Lerps are the white bumps you sometimes see on Eucalyptus leaves. These are made by the nymphs [juveniles] of insects called lerp psyllids. Psyllids feed on leaf sap. Since eucalyptus sap is very rich in carbohydrates, they secrete the excess carbohydrates and use it to build little white domes over themselves. This takes a resource which is completely indigestible by most animals [Eucalyptus sap] and it turns it into something that is highly digestible by a whole range of animals… like birds, other insects, possums [and] bats. So lerps are a really key food resource in Eucalyptus woodlands. At the next level of the food chain, I chose a bird that was particularly dependent on lerps known as bell miners. I wanted to see the effect of artificial light at night at each level of this food chain. This is because all three organisms were vulnerable to… [the] effects of artificial light at night in different ways, and impacts at one level of the food chain might have cascading effects on other levels.”
What did your day-to-day life as a PhD researcher look like?
“It's really varied. In my case, I broke it down into three main work categories. So first up, you've got reading and writing. In the early days, before you start doing any experiments, you've got to learn a lot about your area, find out what's known, what's unknown, form hypotheses and figure out ways of testing them…”
“In the middle, there is much more time spent on fieldwork and lab work. The extent of this will vary depending on the project… In my case, it was probably 50/50… An amazing amount of research involves what we refer to as ‘art and crafts’ where, after you design an experiment, you've got to then figure out a way to test that experiment on a tight budget. For example, building insect traps; you have to think about how you will make it work logistically. You need something that can be easily broken down and transported, but is rigid enough to stand up in a street, doesn't blow over in the wind and all those kinds of things. Fieldwork involved rigging up electric lights in a paddock, finding ways to stop parrots eating sound recorders; all kinds of weird stuff I never thought I'd be doing. Then there’s the actual fieldwork itself — catching bugs, measuring trees — whatever it is you need to do to gather data.”
“The third main activity is statistical analysis and coding, which often go hand in hand. Most of [my] analysis was done in R [programming language], which was another thing that I hadn't done before… I hadn't really appreciated, as an outsider, just how much time scientists spend on statistics and coding. Coding governs a whole lot of things [in research], not just statistics. So you'll use coding to measure the number and diversity of vocalisations in birdsong recordings. You also may use it for physical mapping of study sites. In stats, there is obviously coding involved in statistical analysis, but also for creating the plots for your papers. It's all coding!”
“At the end, you come back to reading and writing. You've gathered all your data, you've written up your results and then you've got to put them in context for your reader.”
What advice would you give to students considering this research pathway?
“There's two aspects to a PhD. On one hand, you are researching something that is of interest to you. This might be a particular organism, process or scientific question… That's a really important element of the PhD. But the other element is about you upskilling. Basically, a PhD is like a research apprenticeship and it's mostly self-driven… Your supervisor is there to guide you but you've got to come up with all the questions yourself, and figure out how to test them. I feel like it's really important to make the most of both these aspects; you want to do a great research project and find out something interesting that the world didn't know before. But you also want to make sure you're making the most of this time to meet people, take on skills, try things out and get outside your comfort zone. This is really important in making yourself as attractive as possible to future employers and a well-rounded researcher.”
What are your future plans following your PhD?
“I would like to take these skills and apply them in an in-house ecologist or research position. I’d like to do work where there's a chance to both conduct research and apply what we know to achieve better outcomes for wildlife. So, for example, working on the practical application of artificial light, working with people who make decisions about installing artificial light fixtures and helping them to find better ways to balance the needs of humans and the needs of wildlife.”